Let this classroom prank be a lesson to all professors about the merits of punctuality.

Coordinated by the Chamber Boys, who apparently have a radio show on the University of Rochester station, this prank effectively crushed the dreams of several medical school hopefuls.

A student claimed to be a teacher and stood in front of an entire lecture hall of students, then detailed the myriad ways in which they would probably fail. This went on for about three minutes, at which point the actual professor waltzed in and began demanding answers. The only response he got was the merry prankster sprinting out of the classroom. Brilliant work.